Published: September 15, 2002

The mood was somber and reflective in most places, but especially so in New York, Washington and Shanksville, Pa., where one of the hijacked jetliners crashed. President Bush visited the three sites and met with survivors and relatives of the dead, ending the day with an address to the nation from Ellis Island.

The events were held under the cloud of a heightened nationwide terror alert -- a code orange -- declared by the federal authorities. Dean E. Murphy

Photo: A 9/11 memorial site in Pennsylvania. (Edward Keating/The New York Times)